Refers to the sometime recipient of male ejaculate resulting from a "circle jerk" (more than two men self-masturbating in a social setting, as to a porn film.) Also, it may refer to a person who masturbates two or more men simultaneously; i.e., at the centre of a circle. Usually used in a derogatory sense.

Used figuratively as a self-deprecation: "I feel like the bucket man at a circle jerk."

see above, or:
"We got a little excited watching the Jenna Jamison video, and Micah was the bucket man!"

Noun - Someone that has drank so much that they have gotten to the stage of throwing up. The term is really used for a person that is, has or is about to vomit.

Verb - Whether if they throw up in a bucket, the toilet, or on themselves, they are still crankin that bucketman.

" I was so drunk last night that i had to crank dat bucketman."
"Josh is about to throw up, you better bucketman that hoe."
" You better give him a bucket so he can bucketman that hoe, before he throws up on your couch."